int
SWFShape_drawCubic(SWFShape shape, float bx, float by,
float cx, float cy, float dx, float dy)
{
int sax = SWFShape_getScaledPenX(shape);
int say = SWFShape_getScaledPenY(shape);
int sbx = (int)rint(bx*Ming_scale) + sax;
int sby = (int)rint(by*Ming_scale) + say;
int scx = (int)rint(cx*Ming_scale) + sbx;
int scy = (int)rint(cy*Ming_scale) + sby;
int sdx = (int)rint(dx*Ming_scale) + scx;
int sdy = (int)rint(dy*Ming_scale) + scy;
return SWFShape_drawScaledCubicTo(shape, sbx, sby, scx, scy, sdx, sdy);
}
void SWFShape_getPen(SWFShape shape, float* penX, float* penY)
{
*penX = (float)(SWFShape_getScaledPenX(shape)/ Ming_scale);
*penY = (float)(SWFShape_getScaledPenY(shape)/ Ming_scale);
}
float SWFShape_getPenY(SWFShape shape)
{
return (float)(SWFShape_getScaledPenY(shape)/Ming_scale);
}
void SWFShape_getPen(SWFShape shape, double* penX, double* penY)
{
*penX = SWFShape_getScaledPenX(shape)/ Ming_scale;
*penY = SWFShape_getScaledPenY(shape)/ Ming_scale;
}
double SWFShape_getPenY(SWFShape shape)
{
return SWFShape_getScaledPenY(shape)/Ming_scale;
}
int SWFShape_drawScaledCubicTo(SWFShape shape, int bx, int by,
int cx, int cy, int dx, int dy)
{
int ax = SWFShape_getScaledPenX(shape);
int ay = SWFShape_getScaledPenY(shape);
/* compute coefficients */
int a1x = -ax + 3*bx - 3*cx + dx;
int a1y = -ay + 3*by - 3*cy + dy;
int a2x = ax - 2*bx + cx;
int a2y = ay - 2*by + cy;
int a3x = -ax + bx;
int a3y = -ay + by;
double a = 6*(a2x*a1y-a2y*a1x);
double b = 6*(a3x*a1y-a3y*a1x);
double c = 2*(a3x*a2y-a3y*a2x);
/* First, chop at inflection points, where a*t^2 + b*t + c = 0 */
double d = b*b - 4*a*c;
float t1 = 0.0, t2 = 1.0;
int nCurves = 0;
cubic pts = { { (float)ax, (float)ay }, { (float)bx, (float)by },
{ (float)cx, (float)cy }, { (float)dx, (float)dy } };
cubic New;
if ( d > 0 )
{
/* two roots */
t1 = (float)((-b-sqrt(d))/(2*a));
t2 = (float)((-b+sqrt(d))/(2*a));
if ( a < 0 )
{
float tmp = t2;
t2 = t1;
t1 = tmp;
}
}
else if ( d == 0 )
{
/* singular root */
t1 = (float)(-b/(2*a));
}
/* use subdivision method to build t=0..t1, t=t1..t2, t=t2..1 curves */
if ( t1 > 0.0 && t1 < 1.0 )
{
subdivideCubicLeft(&New, &pts, t1);
nCurves += SWFShape_approxCubic(shape, &New);
/*
nCurves += SWFShape_drawCubicTo(shape,
new.b.x, new.b.y,
new.c.x, new.c.y,
new.d.x, new.d.y);
*/
subdivideCubicRight(&pts, &pts, t1);
t2 = (t2-t1)/(1-t1);
}
if ( t2 > 0.0 && t2 < 1.0 )
{
subdivideCubicLeft(&New, &pts, t2);
nCurves += SWFShape_approxCubic(shape, &New);
/*
nCurves += SWFShape_drawCubicTo(shape,
new.b.x, new.b.y,
new.c.x, new.c.y,
new.d.x, new.d.y);
*/
subdivideCubicRight(&pts, &pts, t2);
}
nCurves += SWFShape_approxCubic(shape, &pts);
return nCurves;
}
